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Hello Elizabeth,
I did a "grid" of 25 cm each, then the same grid on the photo. I spent around 3 years of work on this, but not continuously of course. Concerning the pencils, not so many -- around 20 or 30 Derwent 3H and some 3B pencil powder (100g).
Actually, here is the final version:
Best regards,
Sergio
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